>I can't seem to get anything to work. If I add a column to my grid all works okay until I try to click on the checkbox. I then get an error reading Data Type Mismatch.

Is the array dimensioned and intialized to .F.?

>If in a cursor based on my table I add a logical column to the cursor, all works until I try and click the checkbox. I get a beep and the checkbox remains unchanged(the cursor is obviously not updateable).

Is it a SQL Cursor? THey're read only. Otherwise, check the ReadOnly property of the grid and the column you're using.